University Of Tasmania

File(s) under permanent embargo

Toxic algal bloom induced by ocean acidification disrupts the pelagic food web

journal contribution
posted on 2023-05-20, 05:19 authored by Riebesell, U, Aberle-Malzahn, N, Achterberg, EP, Alguero-Muniz, M, Alvarez-Fernandez, S, Aristegui, J, Lennart BachLennart Bach, Boersma, M, Boxhammer, T, Guan, W, Haunost, M, Horn, HG, Loscher, CR, Ludwig, A, Spisla, C, Sswat, M, Stange, P, Taucher, J

Ocean acidification, the change in seawater carbonate chemistry due to the uptake of anthropogenic CO2, affects the physiology of marine organisms in multiple ways1. Diverse competitive and trophic interactions transform the metabolic responses to changes in community composition, seasonal succession and potentially geographical distribution of species. The health of ocean ecosystems depends on whether basic biotic functions are maintained, ecosystem engineers and keystone species are retained, and the spread of nuisance species is avoided2. Here, we show in a field experiment that the toxic microalga Vicicitus globosus has a selective advantage under ocean acidification, increasing its abundance in natural plankton communities at CO2 levels higher than 600 µatm and developing blooms above 800 µatm CO2. The mass development of V. globosus has had a dramatic impact on the plankton community, preventing the development of the micro- and mesozooplankton communities, thereby disrupting trophic transfer of primary produced organic matter. This has prolonged the residence of particulate matter in the water column and caused a strong decline in export flux. Considering its wide geographical distribution and confirmed role in fish kills3, the proliferation of V. globosus under the IPCC4 CO2 emission representative concentration pathway (RCP4.5 to RCP8.5) scenarios may pose an emergent threat to coastal communities, aquaculture and fisheries.


Publication title

Nature Climate Change








Institute for Marine and Antarctic Studies


Nature Publishing Group

Place of publication

United Kingdom

Rights statement

Copyright 2018 The Authors, under exclusive licence to Springer Nature Limited

Repository Status

  • Restricted

Socio-economic Objectives

Expanding knowledge in the earth sciences

Usage metrics

    University Of Tasmania